JP3024590B2 - Programmable logic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable logic device.
device (PLD)), and more particularly, to a structure of a programmable logic device that connects an internal circuit and an external terminal.

[0002]

2. Description of the Related Art Conventionally, in connection between a logic circuit component of a PLD and external terminals, connection for general signals has an arbitrary property by programming, but connection for power supply (including ground) is fixed for each device type. .

[0003] Even if the PLDs have the same shape and the same number of terminals, even if the manufacturers are different or the same manufacturer, if the product names are different, the same functionality of the terminals is often not guaranteed.

As a prior art of this kind of technology, Japanese Patent Application Laid-Open
A method disclosed in JP-A-6-163690 has been proposed.

The electronic device arrangement and wiring apparatus disclosed in this publication includes an arrangement means for arranging a plurality of PLDs arranged on a printed circuit board, an inter-device wiring means, and a pin function changing means.

[0006]

However, the prior art has the following drawbacks.

A first problem is that, in the prior art, a large-capacity PLD having the same shape as the current PLD is used.
Alternatively, when the current PLD becomes a discontinued product and becomes a substitute PLD, redesign of the printed circuit board is required.

The reason is that, even if the PLDs have the same shape and condition, if the manufacturers are different, or if the products of the same manufacturer have different product names, there are differences in the power supply terminal and the PLD specific terminal.

The second problem is that in the prior art,
If the terminal arrangement needs to be changed due to a change in the PLD circuit, the printed circuit board is redesigned.

[0010] The reason is that the terminal arrangement of the PLD has been changed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and has been made to solve the above-mentioned drawbacks inherent in the prior art. Therefore, an object of the present invention is to provide a power supply terminal of a PLD, a GN.
It is an object of the present invention to provide a novel programmable logic device that has a function of arbitrarily changing the positions of a D terminal and a signal terminal in a PLD, thereby making it unnecessary to redesign a printed circuit board.

[0012]

In order to achieve the above object, a programmable logic device according to the present invention comprises a programmable logic circuit component (3 in FIG. 1) and a signal pad (PAD) (as required). Power supply PAD, GND
PAD) (4 in FIG. 1), and a wiring channel group (1 in FIG. 1) including a matrix switch for programmably connecting between the logic circuit component and the signal pad. You.

[0013]

In the present invention, the internal interface 2 previously provided as a base has reached the wiring channel group 1.

The connection between the internal interface 2 and an arbitrary pad 4 is realized by turning on a switch selected by a program command among switches prepared in the wiring channel group 1.

The wiring channel group 1 has a switch having a matrix property that enables arbitrary connection between all of the internal interfaces 2 and all of the external terminals 5, so that power and signals can be arbitrarily applied to the external terminals 5. Can be allocated.

[0016]

Next, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing a first embodiment according to the present invention.

Referring to FIG. 1, a first embodiment of the present invention comprises a wiring channel group 1, an internal interface 2, a logic circuit configuration unit 3, a pad (PAD) 4, and an external terminal 5. I have.

The location of the wiring channel group 1 is a main object of the present invention.

The logic circuit configuration unit 3 is composed of a group of logic blocks and wiring resources for realizing a required circuit, which can be arbitrarily programmed by a conventional programming technology, and realizes a required circuit by predetermined program software. Can be.

The internal interface 2 is a conductor for realizing the connection between the logic circuit forming section 3 and the wiring channel group 1, and is realized by programming.
According to the result of the above, one of the general signal, the power supply and the ground is taken.

The wiring channel group 1 has a switch group composed of transistors for connecting the respective channels, and realizes a predetermined connection between the wiring channels by the program software.

The wiring channel group 1 has the number of channels that enable arbitrary connection between the logic circuit constituting section 3 and the external terminal 5.

The pad 4 and the external terminal 5 are of the prior art.
The function is the same as that of the prior art.

Next, a second embodiment of the present invention will be described with reference to FIG.

FIG. 2 is a front view showing a second embodiment according to the present invention.

Referring to FIG. 2, in the second embodiment, wiring channel group 1 shown in the first embodiment is used.
In addition to the above, another wiring channel group 10
Is arranged, and the wiring resources in the wiring channel group 10 are also used as a means for realizing the logic circuit configuration unit 3, thereby increasing the arbitrariness of the terminal designation, and at the same time, when the logic circuit configuration is insufficient for realization. A structure that supplements the wiring properties can be obtained.

As a third embodiment according to the present invention, an embodiment in which the wiring channel group 10 is formed above the wiring channel group 1 can be considered.

Next, the operation of the first embodiment according to the present invention will be described with reference to FIG.

In the PLD according to the present invention, the logic circuit configuration unit 3 is embodied by program software, a predetermined switch in the wiring channel group 1 is turned on, and the PLD between the internal interface 2 and any external terminal 5 is provided. Achieve continuity.

[0031]

Next, an example of the first embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic configuration diagram showing an example of the first embodiment according to the present invention. That is, FIG. 3 is a schematic configuration diagram showing a specific example of the wiring channel group 1.

In FIG. 3, a wiring channel 6 including a matrix switch 8 in a conducting state and a matrix switch 9 in a non-conducting state is arranged on the outer periphery of the logic circuit constituting section 3.

The internal interface 2 is electrically connected to the conductive matrix switch 8 via the wiring channel 7 and reaches the external terminal 5.

The examples of the second and third embodiments can be constructed in substantially the same manner as the first embodiment.

Next, the operation of one example of the first embodiment according to the present invention will be described with reference to FIG.

The matrix switch existing in the wiring channel 6 creates a conductive state or a non-conductive state under the control of the PLD program software according to the present invention.

In this embodiment, when the matrix switch 8 is turned on, the electrical connection with the logic circuit component 3 via the wiring channel 7 is realized via the internal interface 2. Internal interface 2 is a general signal, power supply,
Which of the grounding is to be taken is determined depending on a command of the logic circuit component constructing portion in this program.

The signal characteristics determined by the program are:
The external terminal 5 is reached via the connection route described above.

[0040]

The present invention is constructed and operates as described above. According to the present invention, the following effects can be obtained.

The first effect is that a printed circuit board using a PLD that has become a waste product can be reused, which can contribute to resource reuse.

The reason is that if the shape and the number of terminals are the same, the terminals of the PLD can be arbitrarily set according to the general signal, power supply, and ground of the already designed printed circuit board.

The second effect is that the printed circuit board can be designed in advance without waiting for the determination of the terminal of the PLD.

The reason is that the general signal, power supply, and ground terminals of the PLD can be arbitrarily set in accordance with the terminal design of the printed circuit board designed in advance.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention and showing an electrical connection between an internal circuit in a PLD and an external terminal.

FIG. 2 is a front view showing a second embodiment according to the present invention.

FIG. 3 is a partial schematic configuration diagram showing an example of the first embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wiring channel group 2 ... Internal interface 3 ... Logic circuit constituent part 4 ... Pad (PAD) 5 ... External terminal 6 ... Wiring channel (non-conductive) 7 ... Wiring channel (conductive) 8 ... Matrix switch (conductive) 9 ... Matrix Switch (non-conducting) 10: wiring channel group of logic circuit component

Claims (1)

(57) [Claims] 1. A programmable logic device (hereinafter referred to as P)
In abbreviated as LD), a logic circuit unit, a first wiring channel group that optionally connect the PLD output power is disposed on the outer periphery of the logic circuit unit and a ground terminal, the theory
In the logic circuit component or above the first wiring channel group
And a second wiring different from the first wiring channel group.
Line channels, connected to the logic circuit components and external terminals
Internal interface provided between the
And the first and second wiring channel groups are
For wiring channel and PLD program software control
A programmable logic device comprising a matrix switch that becomes more conductive and non-conductive .